diff mbox series

[v8,04/16] dt-bindings: imx6q-pcie: Add linux,pci-domain as required for iMX8MQ

Message ID 20240108232145.2116455-5-Frank.Li@nxp.com
State Superseded
Headers show
Series PCI: imx6: Clean up and add imx95 pci support | expand

Commit Message

Frank Li Jan. 8, 2024, 11:21 p.m. UTC 
iMX8MQ have two pci controllers. Adds "linux,pci-domain" as required
property for iMX8MQ to indicate pci controller index.

This adjustment paves the way for eliminating the hardcoded check on the
base register for acquiring the controller_id.

	...
	if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
		imx6_pcie->controller_id = 1;
	...

The controller_id is crucial and utilized for certain register bit
positions. It must align precisely with the controller index in the SoC.
An auto-incremented ID don't fit this case. The DTS or fuse configurations
may deactivate specific PCI controllers.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    Keep current to avoid DTB_CHECK warning. After these patch merged. Will add
    linux,pci-domain in all dts file. So dt-binding can remove condition check
    by soc.
    
    Change from v5 to v6
    - rework commit message to explain why need required and why auto increase
    id not work
    
    Change from v4 to v5
    - new patch at v5

 .../bindings/pci/fsl,imx6q-pcie-common.yaml           | 11 +++++++++++
 1 file changed, 11 insertions(+)

Comments

Rob Herring (Arm) Jan. 9, 2024, 6:24 p.m. UTC | #1 
On Mon, Jan 08, 2024 at 06:21:33PM -0500, Frank Li wrote:
> iMX8MQ have two pci controllers. Adds "linux,pci-domain" as required
> property for iMX8MQ to indicate pci controller index.
> 
> This adjustment paves the way for eliminating the hardcoded check on the
> base register for acquiring the controller_id.
> 
> 	...
> 	if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
> 		imx6_pcie->controller_id = 1;
> 	...
> 
> The controller_id is crucial and utilized for certain register bit
> positions. It must align precisely with the controller index in the SoC.
> An auto-incremented ID don't fit this case. The DTS or fuse configurations
> may deactivate specific PCI controllers.
> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
> 
> Notes:
>     Keep current to avoid DTB_CHECK warning. After these patch merged. Will add
>     linux,pci-domain in all dts file. So dt-binding can remove condition check
>     by soc.

Please don't. No need to make required everywhere. Besides not needed, 
it is an ABI break.

Rob
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml
index d91b639ae7ae7..8f39b4e6e8491 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml
@@ -265,6 +265,17 @@  allOf:
             - const: apps
             - const: turnoff
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx8mq-pcie
+              - fsl,imx8mq-pcie-ep
+    then:
+      required:
+        - linux,pci-domain
+
 additionalProperties: true
 
 ...